Mine Development And Mining Methods - Study Mode

[#6] Which excavation is driven upward from one level to another in a mine?
Correct Answer

(A) Raise

Explanation

Solution: Raise is a vertical or inclined opening driven upward from one level to another.The correct answer is: RaiseUsed for ventilation, ore transfer, and escape routes.Drift is horizontal, shaft is vertical from surface, and crosscut connects drifts.

[#7] Which mining method is typically used in thick, steeply dipping ore bodies with competent rock?
Correct Answer

(B) Shrinkage Stoping

Explanation

Solution: Shrinkage Stoping is used for steep, thick ore bodies with strong rock.The correct answer is: Shrinkage StopingBroken ore is left in place to support the stope until most of the ore is extracted.Efficient when wall rock is stable and self-supporting.

[#8] The term "back" in underground mining refers to:
Correct Answer

(C) The roof of an excavation

Explanation

Solution: The term " back " in underground mining refers to the roof or ceiling of an excavation . In simpler terms, when miners are working in an underground tunnel, drift, or stope, the "back" is the surface directly above them. Therefore, the correct answer is Option C . Let's look at why other options are incorrect: Option A: The footwall of the stope - The footwall is the lower, relatively undisturbed side of a mineral vein or ore body. It's not the roof. Option B: The sidewall of the tunnel - The sidewalls are the vertical surfaces on either side of a tunnel, not the top. Option D: The pillar between rooms - Pillars are left-in-place ore or rock to support the overlying strata and prevent collapse. They are not the roof of an excavation.

[#9] Which of the following methods involves artificially collapsing ore to extract it?
Correct Answer

(C) Block Caving

Explanation

Solution: Block Caving is the correct answer. First, let's define Block Caving . Block caving is a bulk mining method used to extract large, relatively low-grade orebodies. It involves creating an undercut in the orebody, then intentionally inducing a controlled collapse of the ore to facilitate extraction from the bottom. The process involves undercutting a large block of ore, usually from several levels, creating a void. The weight of the overlying ore then causes it to fracture and collapse into this void. The broken ore is then drawn off through draw points at the bottom of the caved block. Now let's look at why the other options are incorrect: Option A: Sublevel Stoping : Sublevel stoping involves mining ore in horizontal slices from multiple levels. The ore is broken using blasting and then removed. It does not involve artificially collapsing an entire orebody. Option B: Cut and Fill : Cut and fill is a method where ore is extracted in slices. As each slice is mined, the void is filled with waste material (the "fill"). This is a controlled mining method that does not involve collapsing the ore. Option D: Shrinkage Stoping : Shrinkage stoping is a method where ore is broken and then some of the broken ore is removed, leaving space for more ore to be broken. This space "shrinks" as more ore is removed. This also does not involve the artificial collapse of a large block of ore. In summary, only block caving relies on the intentional and controlled collapse of a large orebody as the primary means of extraction.

[#10] Which method involves simultaneous excavation and backfilling?
Correct Answer

(C) Cut and fill

Explanation

Solution: Cut and fill is a sequential method with filling after each cut.The correct answer is: Cut and fillProvides excellent ground support.Suitable for irregular ore bodies and weak rock.